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5.7. Additional charging
CAUTION
Do not turn on the power unless all operations are complete.
After evacuating the system, add refrigerant.
Do not charge the system with a refrigerant other than R410A.
Always keep to the limit on the total amount of refrigerant. Exceeding the limit on the total amount of refrigerant will lead to malfunction during charging of refrigerant.
Do not reuse recovered refrigerant.
Use an electronic scale to measure the charging amount of refrigerant.
Adding more refrigerant than the speci fi ed amount will cause a malfunction.
Add refrigerant by charging the system with the refrigerant in the liquid state.
When charging the refrigerant, take into account the slight change in the composition of the gas and liquid phases, and always charge from the liquid phase side whose composition is stable. Adding refrigerant through the gas pipe will cause a malfunction.
Check if the steel cylinder has a siphon installed or not before fi lling. (There is an indication “with siphon for fi lling liquid” on the steel cylinder.)
Filling method for cylinder with siphon
R410A
Gas
Set the cylinder vertical and
(Liquid can be siphon inside.) fi fi ll with the liquid.
lled without turning bottom up with the
Liquid
Filling method for other cylinders
R410A
Gas
Turn bottom up and fi ll with liquid.
(Be careful to avoid turning over the cylinder.)
Liquid
Be sure to use the special tools for R410A for pressure resistance and to avoid mixing of impure substances.
If the units are further apart than the maximum pipe length, correct operation cannot be guaranteed.
Make sure to back closing valve after refrigerant charging. Otherwise, the compressor may fail.
Minimize refrigerant release to the air. Excessive release is prohibited under the Freon
Collection and Destruction Law.
5.7.1. If additional refrigerant is required
• When the piping is longer than chargeless piping length, additional charging is necessary.
1) Remove the charging port cap from the liquid pipe.
2) Attach a charging hose to the refrigerant cylinder, and connect it to the charging port.
3) Add refrigerant by calculating the additional refrigerant volume in accordance with the table below.
4) Remove the charging hose and install the charging port cap.
5) Remove the body caps (gas pipe, and liquid pipe), and open the valves.
6) Close the body caps.
* Tighten the body caps and charging port caps to the torque values speci fi ed in Table
A of “5.4. Connection system”.
To open and close the valves,
Use an M5 hexagon wrench for liquid pipes.
Use an M10 hexagon wrench for gas pipes.
Piping length (L1) *Chargeless [m]
30
Additional charging amount
L1* > Chargeless piping length
Refrigerant pipe size
[mm (in.)]
Liquid
Gas
Standard
12.70 (1/2)
25.40 (1)
~30 m 40 m 50 m
Piping length
60 m
Refer to “4.3. Refrigerant pipe size and allowable piping length”.
70 m 75 m g/m
None 1,100 g 2,200 g 3,300 g 4,400 g 4,950 g 110 g/m
6. ELECTRICAL WIRING
Cable
Power Supply Cable
Cable size [mm²]
2.5 to 6.0
Type
Type60245 IEC66
Remarks
4 Cable + Ground
3 Φ 415 V
Connection Cable 1.5
Type60245 IEC57
3 Cable + Ground
1 Φ 240 V
Max. Cable Length : Limit voltage drop to less than 2%. Increase cable if voltage drop is
2% or more.
6.1. Selecting circuit breaker and wiring
CAUTION
Be sure to install a breaker of the speci fi ed capacity.
Regulation of cables and breaker differs from each locality, refer in accordance with local rules.
Breaker and wiring speci fi cations
Breaker capacity
[A]
20
Earth leakage breaker
[mA]
30
Power supply cable
Cable size
[mm²]
2.5 to 6.0
Connection cable
Cable size
[mm²]
1.5
Max. length
[m]
76
• Selected sample: Select the correct cable type and size according to the country or region’s regulations.
• Max. wire length: Set a length so that the voltage drop is less than 2%. Increase the wire diameter when the wire length is long.
• Select the appropriate breaker of the described speci fi cation according to the national or regional standards.
• Select the breaker that enough load current can pass through it.
• Before starting work check that power is not being supplied to all poles of the indoor unit and outdoor unit.
• Install all electrical works in accordance to standard.
• Install the disconnect device with a contact gap of at least 3mm in all poles nearby the units. (Both indoor unit and outdoor unit)
• Wiring size must comply with the applicable local and national code.
6.2. Notes for electrical wiring
WARNING
Wiring connections must be performed by a qualified person in accordance with specifications.
The rated supply of this product is 50 Hz, 415 V of 3-phase, 4-wire. Use a voltage within the range of 342 to 456 V (50 Hz).
Make sure to perform earthing (grounding) work. Improper earthing (grounding) work can cause electric shocks.
Before connecting the cables, make sure the power supply is OFF.
Be sure to install an earth (ground) leakage breaker. Otherwise, it will cause electric shock or fire.
Select a breaker (Included with earth leakage circuit breaker) of appropriate capacity and install one at every power supply of an outdoor unit. Wrong selection of breakers or transition wiring will lead to electric shock and fire.
Do not connect AC power supply to the transmission line terminal board.
Improper wiring can damage the entire system.
Install a breaker (Included with earth leakage circuit breaker) in accordance with the related laws and regulations.
Connect the connector cable securely to the terminal.
Faulty installation can cause a fire.
Make sure to secure the insulation portion of the connector cable with the cable clamp.
A damaged insulation can cause a short circuit.
Never install a power factor improvement condenser. Instead of improving the power factor, the condenser may overheat.
Before servicing the unit, turn the power supply switch OFF. Then, do not touch electric parts for 10 minutes due to the risk of electric shock.
Always use a separate power supply line protected by a circuit breaker operating on all cables with a distance between contact of 3 mm for this unit.
Do not modify power cable, use extension cable or branch wiring. Improper use may cause electric shock or fire by poor connection, insufficient insulation or over current.
Use ring terminals and tighten the terminal screws to the specified torques, otherwise, abnormal overheating may be produced and possibly cause serious damage inside the unit.
Securely install the electrical box cover on the unit. An improperly installed service panel can cause serious accidents such as electric shock or fire through exposure to dust or water.
If the supply cable is damaged, it must be replaced by the manufacturer, its service agent or similarly qualified persons in order to avoid a hazard.
En-8
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